<?php

namespace App\Http\Controllers\Api\Admin;

use App\Http\Controllers\Controller;
use App\Models\Application;
use App\Models\ApplicationReviewScore;
use App\Models\Competition;
use App\Models\Reviewer;
use App\Models\ReviewerScope;
use App\Support\BizDateTime;
use Illuminate\Http\JsonResponse;
use Illuminate\Support\Facades\DB;

class DashboardController extends Controller
{
    public function show(Competition $competition): JsonResponse
    {
        $competition->loadMissing(['tracks', 'formSchema', 'reviewFormSchema']);

        $applicationCounts = Application::query()
            ->select('status', DB::raw('COUNT(*) as total'))
            ->where('competition_id', $competition->id)
            ->groupBy('status')
            ->pluck('total', 'status');

        $totalApplications = (int) $applicationCounts->sum();
        $submittedApplications = (int) ($applicationCounts['submitted'] ?? 0);
        $draftApplications = (int) ($applicationCounts['draft'] ?? 0);
        $reviewedApplications = Application::query()
            ->where('competition_id', $competition->id)
            ->where('status', 'submitted')
            ->whereHas('reviewScores')
            ->count();

        $reviewScoreCount = ApplicationReviewScore::query()
            ->whereHas('application', fn ($query) => $query->where('competition_id', $competition->id))
            ->count();

        $reviewerCount = Reviewer::query()->count();
        $activeReviewerCount = Reviewer::query()->where('status', 'active')->count();
        $reviewerScopeCount = ReviewerScope::query()
            ->where('competition_id', $competition->id)
            ->count();

        $scopeCountsByTrack = ReviewerScope::query()
            ->select('track_code', DB::raw('COUNT(*) as total'))
            ->where('competition_id', $competition->id)
            ->groupBy('track_code')
            ->pluck('total', 'track_code');

        $applicationCountsByTrack = Application::query()
            ->select([
                'track',
                DB::raw('COUNT(*) as total'),
                DB::raw("SUM(CASE WHEN status = 'submitted' THEN 1 ELSE 0 END) as submitted_total"),
            ])
            ->where('competition_id', $competition->id)
            ->groupBy('track')
            ->get()
            ->keyBy(fn ($row) => (string) ($row->track ?? ''));

        $trackStats = $competition->tracks
            ->map(function ($track) use ($applicationCountsByTrack, $scopeCountsByTrack): array {
                $row = $applicationCountsByTrack->get((string) $track->track_code);

                return [
                    'track_code' => $track->track_code,
                    'track_title' => $track->title,
                    'is_enabled' => (bool) $track->is_enabled,
                    'applications_count' => (int) ($row?->total ?? 0),
                    'submitted_count' => (int) ($row?->submitted_total ?? 0),
                    'reviewer_scope_count' => (int) ($scopeCountsByTrack[$track->track_code] ?? 0),
                ];
            })
            ->values();

        $recentApplications = Application::query()
            ->where('competition_id', $competition->id)
            ->withCount('reviewScores')
            ->orderByDesc('submitted_at')
            ->orderByDesc('updated_at')
            ->orderByDesc('id')
            ->limit(8)
            ->get()
            ->map(fn (Application $app) => [
                'id' => $app->id,
                'status' => $app->status,
                'project_name' => $app->project_name ?? '',
                'player_name' => $app->player_name ?? '',
                'track_code' => $app->track ?? '',
                'track_title' => $trackStats
                    ->firstWhere('track_code', $app->track ?? '')['track_title']
                    ?? ($app->track ?? ''),
                'submitted_at' => $app->submitted_at?->toIso8601String(),
                'updated_at' => $app->updated_at?->toIso8601String(),
                'submitted_review_count' => (int) ($app->review_scores_count ?? 0),
            ])
            ->values();

        return response()->json([
            'competition' => [
                'id' => $competition->id,
                'slug' => $competition->slug,
                'name' => $competition->name,
                'status' => $competition->status,
                'published' => (bool) $competition->published,
                'signup_open_at' => BizDateTime::toIso8601($competition->signup_open_at),
                'signup_close_at' => BizDateTime::toIso8601($competition->signup_close_at),
                'form_schema_id' => $competition->form_schema_id,
                'review_form_schema_id' => $competition->review_form_schema_id,
                'pledge_content_html' => $competition->pledge_content_html,
            ],
            'summary' => [
                'applications_total' => $totalApplications,
                'applications_draft' => $draftApplications,
                'applications_submitted' => $submittedApplications,
                'applications_reviewed' => (int) $reviewedApplications,
                'applications_pending_review' => max(0, $submittedApplications - (int) $reviewedApplications),
                'review_scores_total' => (int) $reviewScoreCount,
                'reviewers_total' => (int) $reviewerCount,
                'reviewers_active' => (int) $activeReviewerCount,
                'reviewer_scopes_total' => (int) $reviewerScopeCount,
                'tracks_total' => $competition->tracks->count(),
                'tracks_enabled' => $competition->tracks->where('is_enabled', true)->count(),
            ],
            'setup' => [
                'published' => (bool) $competition->published,
                'signup_form_schema' => $competition->form_schema_id !== null,
                'tracks' => $competition->tracks->where('is_enabled', true)->count() > 0,
                'pledge' => trim(strip_tags((string) $competition->pledge_content_html)) !== '',
                'review_form_schema' => $competition->review_form_schema_id !== null,
                'reviewer_scopes' => $reviewerScopeCount > 0,
            ],
            'track_stats' => $trackStats,
            'recent_applications' => $recentApplications,
        ]);
    }
}